REV90029

• Permit No: M1985026
• IBM Index Class Name: Revision
• Doc Date: 8/26/1998
• Doc Name: CONSTRUCTION MATERIALS REGULAR 112 OPERATION
• Type & Sequence: AM1
• Media Type: D
• Archive: No

Table No: 1
Coulson Excavating Company, Inc.
Challenger Pit
Post Mining Evaporative Losses

~MOnth " Percent of
Anrjual
. Evaparatiora Gross" Lake.
Evaponatidn
(ft} .
Precipitation
~ (in) Effective
Pr~cipitatiop"
-(ftL: NAt Lfili~
EvapQratlOr~.
(Vert;-if/ac[e)- TOt07 Cite P
~vagor~~A~..
~. r ,.
Jan 3.0% 0.10 0.34 0.02 0.08 1.65
Feb 3.5% 0.12 0.28 0.02 0.10 2.07
Mar 5.5% 0.19 0.87 0.05 0.14 2.74
Apr 9.0% 0.31 1.45 0.08 0.22 4.46
May 12.0% 0.41 2.37 0.14 0.27 5.44
June 14.5% 0.50 1.96 0.11 0.38 7.62
July 15.0% 0.51 1.37 0.08 0.43 8.65
Aug 13.5% 0.46 1.10 0.06 0.40 7.94
Sept 10.0% 0.34 0.96 0.06 0.29 5.71
Oct 7.0% 0.24 0.97 0.06 0.18 3.65
Nov 4.0% 0.14 0.52 0.03 0.11 2.13
Dec 3.0% 0.10 0.35 0.02 0.08 1.64
Total 100% 3.42 12.54 0.73 2.69 53.70
Exposed Water Surface = 20 acres
Annual Preciptiation = 12.54 inches -Taken from Windsor Weather Station
Gross Annual Evaporation = 41 inches -Taken from NOAH Technical Report NWS 33
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